A guy-wire, guy-line, guy-rope or guide-wire, also known as simply a guy, is a tensioned cable designed to add stability to a free-standing structure. They are used commonly in ship masts, radio masts, wind turbines and communication towers. A thin vertical mast supported by guy wires is called a guyed mast. Structures that support antennas are frequently of a lattice construction and are called "towers".
This section contains articles related to tower components, such as guy wires, footings, brackets, headframes, and more.